MAX8570 datasheet(2/11 Pages) MAXIM

2 / 11 page

High-Efficiency LCD Boost

with True Shutdown

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = V SHDN = 3.6V, SW open, VFB = 1.3V (MAX8570/MAX8571/MAX8574) or VOUT = 16V (MAX8572/MAX8573/MAX8575), TA =

-40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

VCC, SHDN to GND ..................................................-0.3V to +6V

SW to GND .................................................-0.3V to (VCC + 0.3V)

FB to GND (MAX8570/MAX8571/

MAX8574)...............................................-0.3V to (VCC + 0.3V)

OUT to GND (MAX8572/MAX8573/MAX8575) .......-0.3V to +30V

LX to GND ..............................................................-0.3V to +30V

ILX, ICC ..............................................................................600mA

Continuous Power Dissipation (TA = +70°C)

µDFN (derate 4.5mW/°C above +70°C)....................357.8mW

SOT23-6 (derate 8.7mW/°C above +70°C)...............695.7mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC Input Voltage Range

2.70

5.50

VCC Undervoltage Lockout

VCC rising, 50mV typical hysteresis

2.33

2.5

2.65

VCC Supply Current

µA

TA = +25

°C

0.05

VCC Shutdown Current

SHDN = GND, VCC = 5.5V

TA = -40

°C to +85°C

0.05

µA

Line Regulation

Circuit of Figure 3, VOUT = 15V, ILOAD = 5mA,

VCC = 2.7V to 5.5V

0.1

%/V

Load Regulation

Circuit of Figure 3, VOUT = 15V, ILOAD = 0 to 5mA

0.1

%/mA

TA = 0

°C to +85°C

1.216

1.226

1.236

FB Regulation Voltage

TA = -40

°C to +85°C

1.2137

1.2383

FB Input Bias Current

-50

-4

+50

TA = 0

°C to +85°C

14.85

15.15

OUT Regulation Voltage

TA = -40

°C to +85°C

14.813

15.187

OUT Input Bias Current

VOUT = 15V

2.4

4.4

µA

LX Voltage Range

MAX8571/MAX8573

0.217

0.241

0.267

MAX8570/MAX8572

0.088

0.101

0.108

LX Switch Current Limit (Note 2)

MAX8574/MAX8575

0.425

0.484

0.540

MAX8571/MAX8573/MAX8574/MAX8575, ILX = 100mA

0.9

1.5

LX On-Resistance

MAX8570/MAX8572, ILX = 50mA

1.5

2.4

TA = +25

°C

0.01

LX Leakage Current

VLX = 28V

TA = -40

°C to +85°C

0.05

µA

Maximum LX On-Time

811

µs

VFB > 1V or VOUT > 12.2V

0.8

1.2

Minimum LX Off-Time

VFB = 0.25V or VOUT = 3.4V

4.0

6.0

µs

Current-Limit Propagation Delay

SHDN Low Level (VIL)

2.7V

≤ VCC ≤ 5.5V

0.7

4.2V

≤ VCC ≤ 5.5V

1.5

SHDN High Level (VIH)

2.7V

≤ VCC < 4.2V

1.4

SHDN Leakage Current

-1

µA

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